PNICHOLS "I stand by my assertion that - if you have and are allowed the time and sound tolerance environment - just a small generator running longer will charge RV batteries very close to the same cost as a larger generator charging quicker."
JRNYMN7 "Now here’s the kicker…My eu2000i, on eco mode, uses about 1/4 of a gallon of gas in 2 hours, so about 88 cents U.S. So, it actually uses 1/2 the gas to power the 45 amper for 2 hours with the 2000i than it does to power a 15 amper for 5 hours with the 650. It's all about efficiency vs. waste."
so, $1.75 = $0.88. o.k, understood.
(It appears assertions and assumptions have a lot in common).